Molded part made of thermoplastic material

Abstract

A molded part has welding sleeve portions (2) which are each provided with a heating coil (3a, 3b) for joining to tubular parts. A cylindrical sleeve end part (7) can be tensioned by at least one tensioning system against the inserted tubular part, thus providing fixing and holding of the parts before welding and during welding.

We claim: 
     
       1. Molded part made of thermoplastic material having at least one welding sleeve part having a plug-in end and an electrical heating coil for connecting the molded part to a tubular part, wherein the plug-in end of the welding sleeve part can be brought into abutment with the tubular part in a fitting manner, the improvement which comprises means for forming a connection between the tubular part and the welding sleeve part, said means comprises at least one tensioning system located on the plug-in end of the welding sleeve part, said tensioning system comprises at least one axially extending slot provided on said plug-in end, a pair of protuberances provided on said plug-in end on either side of said at least one recess and a tensioning element located on said pair of protuberances and bridging said slot. 
     
     
       2. Mold part according to claim 1 wherein said tensioning element is removable from said protuberances. 
     
     
       3. Mold part according to claim 3 wherein said protuberances are provided with at least one projection surface and said tensioning element engages said at least one projection surface. 
     
     
       4. Mold part according to claim 3 wherein said at least one projection surface has an undercut and said tensioning element engages said undercut. 
     
     
       5. Mold part according to claim 4 wherein said tensioning element is formed as a closed wire loop which engages said undercut. 
     
     
       6. Mold part according to claim 5 wherein said closed wire loop is provided with a lever means for drawing said protuberances toward each other. 
     
     
       7. Mold part according to claim 1 wherein said protuberances are positioned on a circumferencial surface of said plug-in end.